Fast transient response voltage regulator with predictive loading
a voltage regulator and transient response technology, applied in the direction of electric variable regulation, process and machine control, instruments, etc., can solve the problems of limiting the effectiveness of the target circuit, slow transient response of a typical ldo, and limiting the transient response of the voltage regulator, so as to reduce the magnitude of the current loading transition upon the fast change in current loading by the target circuit, and increase the current loading
Active Publication Date: 2019-01-03
MACRONIX INT CO LTD
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Benefits of technology
The patent describes a circuit and method for supplying a regulated voltage to a circuit that changes its current load quickly. It includes a voltage regulator and a current loading circuit that applies a current load to the output of the regulator before the change in current load occurs. This reduces the fluctuations in the regulated voltage and improves the stability of the output current waveform. Overall, this technology ensures a steady and smooth voltage supply to the target circuit, even during rapid changes in current loading.
Problems solved by technology
In integrated circuits having rapidly changing loads, the transient response of the voltage regulators can be a limiting property.
These spikes or fluctuations can limit the effectiveness of the target circuit.
This large gate capacitance increases the time constant of the feedback loop, and makes the transient response of a typical LDO relatively slow compared to nanosecond scale switching in electronic circuits.
As a result, a target circuit can be exposed to spikes or fluctuations in the regulated voltage during events that cause a change in current loading by the target circuit.
Method used
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[0016]A detailed description of embodiments of the present invention is provided with reference to the FIGS. 1-4.
[0017]FIG. 1 illustrates a circuit 20 connected to a target circuit 12. The circuit 20 includes a voltage regulator 10, such as an LDO voltage regulator, and predictive loading circuits 15. The circuit 20 supplies a regulated voltage VDD_INT generated by the voltage regulator 10 as an internal supply voltage on an output node 11 to the target circuit 12. The target circuit 12 includes a current sink 13 and control logic 14. The control logic 14 can supply a mode change signal C1 to the current sink 13 which causes a fast change in current loading by the target circuit 12. Also, the control logic 14 can supply a signal C2 to predictive loading circuits 15. Although as illustrated, the signal C2 is provided by the control logic 14 in the target circuit, in other configurations, logic outside the target circuit can produce the signal C2.
[0018]In one example, the target circu...
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A circuit and a method for supplying a regulated voltage to a target circuit characterized by fast changes in current loading are described. A voltage regulator supplies the regulated voltage to an output node. A current loading circuit is connected to the output node of the voltage regulator. Logic causes the current loading circuit to apply a current load to the output node during a pre-loading interval starting in advance of an event that increases current loading in the target circuit and ending upon occurrence of the event. Logic is included to cause the current loading circuit to apply a current load to the output node during a post-loading interval starting upon occurrence of an event that decreases current loading in the target circuit.
Description
BACKGROUNDTechnical Field[0001]The present invention relates to voltage regulators, including voltage regulators used in integrated circuits having rapidly changing loads.Description of Related Art[0002]Voltage regulators are utilized in integrated circuit design to provide a supply voltage to internal circuitry that can be more stable than an external power supply.[0003]In integrated circuits having rapidly changing loads, the transient response of the voltage regulators can be a limiting property. If the current load of the target circuit changes rapidly, such as on the order of the transient response of the voltage regulator, then the regulated voltage provided can spike, overshoot, undershoot or fluctuate during the transition. These spikes or fluctuations can limit the effectiveness of the target circuit.[0004]For example, a voltage regulator, in a class of regulators known as low dropout LDO voltage regulators, comprises a power MOSFET that is connected between an external pow...
Claims
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IPC IPC(8): G05F1/565
CPCG05F1/565G05F1/56G05F1/462G05F1/575
Inventor HUNG, CHUN-HSIUNGYANG, SHANG-CHI
Owner MACRONIX INT CO LTD